遥感卫星的介绍，包括轨道的计算、和常用遥感卫星参数等内容-The introduction of remote sensing satellites, including the calculation of the track, and used remote sensing satellite parameters, etc.

日本准天顶卫星的轨道演示，包括地球同步卫星轨道等不同轨道降交点变化演示 -Japanese Quasi-Zenith satellite orbit demonstration